EP2691285A1 - Dispositif de poussoir avec rattrapage de jeu pour direction à crémaillère de véhicule automobile - Google Patents
Dispositif de poussoir avec rattrapage de jeu pour direction à crémaillère de véhicule automobileInfo
- Publication number
- EP2691285A1 EP2691285A1 EP12706631.4A EP12706631A EP2691285A1 EP 2691285 A1 EP2691285 A1 EP 2691285A1 EP 12706631 A EP12706631 A EP 12706631A EP 2691285 A1 EP2691285 A1 EP 2691285A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pad
- outer ring
- notches
- pusher device
- eccentric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000005755 formation reaction Methods 0.000 claims description 4
- 238000002513 implantation Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
- B62D3/123—Steering gears mechanical of rack-and-pinion type characterised by pressure yokes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/26—Racks
- F16H55/28—Special devices for taking up backlash
- F16H55/283—Special devices for taking up backlash using pressure yokes
Definitions
- the present invention relates, in a general manner, to the technical field of rack-and-pinion steering of motor vehicles. More particularly, this invention is concerned with the device called "push line” or simply “push” of a rack-and-pinion direction, the function of which is to maintain the rack in meshing contact with the pinion of steering while compensating the tooth defects, this device also having the role of facilitating the mounting of the pinion in the housing of the rack and pinion direction. Even more particularly, the invention relates to an "eccentric" type of pusher device, which is provided with a system for automatic adjustment of the clearance between the pinion and the rack.
- a steering pinion In a rack-and-pinion steering system of a motor vehicle, a steering pinion is rotatably connected with a steering column, operated using the steering wheel of the vehicle, most often with the aid of hydraulic assistance or electric.
- the pinion is engaged with a rack, slidably mounted in a longitudinal direction in a steering box.
- the two ends of the rack, external to the housing, are coupled respectively to two steering rods, which are themselves respectively associated with the left and right steering wheels of the vehicle.
- the non-racked, non-racking mechanism linked to the front wheels of the vehicle by means of the links, is subject to upward forces, shocks and vibrations, depending on the condition the road traveled by the vehicle. Because of the angle formed by the rods with the rack, it can then occur a force on the rack, which may move away from the pinion. For this reason, the rack is usually permanently applied against the pinion by a so-called "pusher" device, which acts elastically on the back of the rack in the region of the pinion to strongly press the teeth of the rack against the pinion. Thanks to the pusher, the meshing faults of the rack and pinion are compensated, and this pusher also ensures the gu idage of the rack, controlling the sliding force of the rack in the steering gear.
- the pusher device comprises a pusher itself, which is a rigid part mounted to move in translation substantially perpendicular to the longitudinal axis of the rack, and biased towards the back of the rack by elastic means, so as to rest on the back of the rack by an end portion of suitable shape, in particular a concave profile portion, usually constituted by a friction pad to obtain a low coefficient of friction between the skate and the rack.
- the elastic means may be constituted by a helical spring alone or by a metal elastic washer or elastomer, or by a combination of such elastic elements. These elastic means are supported on a set screw, which allows adjustment of the back of the pusher and which materializes the end stop of the pusher.
- Such a pusher device provides a permanent contact between the pinion and the rack, while compensating for defects in the teeth of these mechanical members.
- the elastic means which act between the adjusting screw and the pusher, also compensate for the wear in operation of the pinion of the rack and the friction pad, but the recoil of the pusher, in other words the distance between the pusher and its abutment. constituted by the adjusting screw, is increased by a value equal to the cumulative wear of the components.
- a rotary shaped pad annular or arcuate comprises an eccentric portion which pushes the rack towards the pinion, the rotary pad being rotatably mounted in a housing, about an axis parallel to the longitudinal axis of the rack.
- the inner periphery of the shoe is eccentric with respect to its outer periphery, so that when the pad rotates in the casing, its eccentric periphery forms a bearing surface applied against the back of the rack and pushing it towards the teeth of the pinion. , in order to keep them engaged with the rack.
- the rotary pad is rotatably mounted on a support housing, itself slidably mounted in the steering housing, according to a direction parallel to the plane of the teeth of the rack and orthogonal to the longitudinal axis of this rack.
- a first elastic element such as a compression spring is disposed between the wall of the sliding housing and the rotary pad, to urge this pad in rotation in a predefined direction.
- Another resilient member such as an O-ring is disposed between the sliding housing and a fixed portion, such as the steering housing.
- the rotary pad has a radial arm on which the force of the compression spring is exerted. This pad has an arcuate shape and "corner" that allows the device to be particularly compact.
- an eccentric pusher in another particular embodiment of an eccentric pusher, described in the published French patent application FR 2 951 797 A1 in the name of the Applicant, there is provided a mechanism for compensating play, with a thrust member leaning against a radial arm of the skid rotary under the force of a compression spring inserted between the thrust member and a member secured to the support of the pad.
- a movable stop rotatably mounted relative to said element, comprises teeth with stepped teeth which cooperate with notches of the thrust member, the movable stop being connected via a torsion spring to said element.
- the notches of the thrust member cooperate successively with the stepped teeth of the movable stop, for successive play catch-ups during the life of the steering system.
- the present invention aims to improve the eccentric push devices, and more particularly the pushers having an automatic play catch-up function, by providing a solution particularly robust from the point of view of its mechanical strength, while maintaining a simplicity of structure and manufacturing.
- the subject of the invention is an eccentric pusher device for rack-and-pinion steering of a motor vehicle, the pusher device comprising an annular-shaped pad whose inner periphery is eccentric with respect to the outer periphery, said pad being rotatably mounted and biased in rotation in one direction by spring means and being adapted to be applied by its eccentric inner periphery against the back of the rack to push it towards the teeth of the steering pinion, the eccentric pusher device being provided with an automatic backlash mechanism, this eccentric pusher device being characterized in that the backlash mechanism comprises a fixed outer ring, within which is rotatably mounted the pad, the ring outer being internally notched and the pad being provided at its outer periphery with hooking means cooperating with the notches of the outer ring, or conversely the pad being externally serrated and the outer ring being internally provided with hooking means cooperating with the notches of the pad, and the spring means urging the pad in rotation relative to the outer ring .
- the outer ring internally comprises a plurality of series of notches, distributed over its circumference, while the pad is provided at its outer periphery with protruding elastic strips circumferentially spaced and cooperating with the notches of the outer ring, or conversely the shoe has externally several series of notches while the outer ring internally comprises spaced elastic blades, each resilient blade being provided to cooperate with one of the series of notches.
- the arrangement of the series of notches of the outer ring or the rotary pad and the elastic blades of the shoe or ring is such that, when certain notches are engaged with the corresponding elastic blades, other notches belonging to Other series are waiting, which allows to multiply the angular positions of attachment of the shoe relative to the outer ring, without having to make notches too small.
- the configuration of the notches is also such that, during each passage from one notch to another, a functional game is created between the pinion and the rack, this game remaining very small.
- the outer ring internally comprises an annular portion on which are formed series of notches, and at least one other annular portion adjacent to the preceding one, on which are formed contact and guiding surfaces cooperating with the outer periphery of the pad.
- These contact and guide surfaces may belong to relief formations of the outer ring, which further comprise circumferential shoulders for the stop in axial translation of the pad.
- the outer ring may comprise, externally, at least one lug provided for the immobilization in rotation of the outer ring, relative to the steering housing in which is mounted said ring.
- the eccentric pusher device object of the invention permanently maintains a reduced clearance between the pinion and the rack of the steering system, this which eliminates the usual noises of traditional pushers.
- the configuration of the device eliminates the tilt noise observed in the case of conventional pushers, which tilt on either side of the axis of the rack.
- the spring means comprise at least one internal spring, mounted between an inner strut of the outer ring and a bearing surface provided on the pad, the inner spring thus urging the pad in rotation in the desired meaning. In this case all functions are performed inside the device.
- the spring means comprise an external spring, acting via a thrust finger on the pad, in which case the outer ring may comprise an opening through which the thrust finger passes to reach the skate.
- the external location of the spring makes it possible to implement a larger spring, if necessary.
- Figure 1 is a perspective view of a pusher device according to the present invention, in a first embodiment
- FIG. 1 is another perspective view of the pusher device of Figure 1
- Figure 3 is a perspective view of the only outer ring of the pusher device of Figures 1 and 2,
- Figure 4 is another perspective view of this outer ring
- Figure 5 is a front view of the outer ring of Figures 3 and 4,
- Figure 6 is a perspective view of the rotary pad alone
- Figure 7 is a front view, showing the rotary pad, mounted inside the outer ring,
- Figures 8 to 13 are diagrams illustrating the operation of the eccentric pusher device according to the first embodiment
- Figure 14 is a perspective view of a pusher device according to the present invention, in a second embodiment
- FIG 15 is another perspective view of the pusher device of Figure 14.
- FIG. 16 very schematically represents an example of implantation, in a steering system, of the pusher device according to the first embodiment of the invention
- Figure 17 shows very schematically an example of implantation, in a steering system, of the pusher device according to the second embodiment of the invention.
- FIGS. 1 to 13 A first embodiment of the eccentric pusher device, generally designated 2, is shown in FIGS. 1 to 13.
- This pusher device 2 comprises a fixed outer ring 3, shown alone in FIGS. 3 to 5, and a rotary pad 4, shown alone on FIG. Figure 6 but intended to be rotatably mounted within the outer ring 3, as shown in Figures 1, 2 and 7.
- the relief formations 7 are located in correspondence with series 5 notches 6, so as to provide recessed areas 10 facilitating the introduction of the pad 4.
- the outer ring 3 has, externally, a lug January 1 provided for its immobilization in rotation relative to a steering box 12 (see also Figure 16).
- the outer ring 3 also has, internally, a substantially radially oriented strut 13 designed to support an internal spring (as described below).
- a hole 14 adapted to receive a removable lug, usable during the mounting operations of the pusher device 2.
- the annular pad 4 more particularly visible in FIG. 6, has a circular internal periphery 15 which is eccentric with respect to its outer periphery 16 which is also circular.
- This annular pad 4 is provided, on its outer periphery 16, protruding resilient blades 17 spaced circumferentially, the elastic blades 17 being the same number as the series of 5 notches, for example four in number.
- annular pad 4 In the annular pad 4 is formed a recess 18, provided to accommodate the internal spring. This annular pad 4 further comprises a hole 19 adapted to receive the removable lug used during assembly operations.
- the rotary pad 4, thus formed, is put in place inside the outer ring 3, the recessed areas 10 of this ring facilitating the introduction of the elastic blades 17 of the pad, which are initially in the free state.
- a pin 20 is inserted into the respective holes 14 and 19 of the ring 3 and the pad 4, these holes being matched, to temporarily immobilize the pad 4 relatively. to the ring 3.
- An internal spring 21 is then put in place in the recess 18, so as to bear on the one hand against the strut 1 3 of the ring 3 and on the other hand against a surface 22 of the pad 4, the spring 21 exerting a thrust force F in the circumferential direction.
- the inner periphery 15 of the shoe 4, thus mounted, has an eccentricity E with respect to the ring 3.
- the pad 4 After removal of the lug 20, the pad 4 is released relative to the ring 3, and the spring 21 also released rotates the pad 4.
- the rack whose initial position is symbolized by dotted through 23 eccentric opening of the pad 4, the thrust force F rotates the pad 4 to an initial contact and equilibrium position, in which the elastic strips 17 of the pad 4 are hooked onto certain notches 6 of the ring 3.
- FIGS 10 and 1 1 show an intermediate position of the resilient blades 17, and Figures 12 and 13 illustrate a position at the end of life, with a strong wear catch, the elastic blades 17 have reached the terminal 6 notches series 5 notches.
- FIGS. 14 and 15 in which the elements corresponding to those described above are designated by the same references, represent a second embodiment of the eccentric pusher device 2.
- the second embodiment is distinguished from the first by the fact that that the internal spring, biasing the annular pad 4, is replaced by an external spring, that is to say located on the radially outer side of the ring 3.
- the external spring is in particular a helical spring 24, housed in the casing of detection 1 2 as shown in Fig ure 1 7.
- the outer ring 3 has a through opening 26, which the thrust finger 25 passes therethrough so that the latter can reach the pad 4 placed inside the ring 3.
- the choice of materials constituting the ring 3 and the pad 4, which are in particular moldable plastic materials, is such that it best meets the functional requirements of sliding of the pad 4 relative to the ring 3, and mechanical strength and thermal, as well as molding constraints.
- FIG. 16 illustrates, in the case of a double pinion steering system, the implantation of the eccentric pusher device according to the first embodiment previously described.
- Two eccentric pusher devices 2, of similar structure, are thus implanted in the steering casing 12, these two devices having their respective pads 4 traversed by the same rack (not shown).
- FIG. 17 illustrates, again in the case of a double pinion steering system, the implantation of the eccentric pusher device according to the second embodiment previously described.
- the steering housing 12 here comprises hollow protrusions 27, able to accommodate the respective external coil springs 24 of the two eccentric pusher devices 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Power Steering Mechanism (AREA)
- Transmission Devices (AREA)
- Lock And Its Accessories (AREA)
- Steering Controls (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL12706631T PL2691285T3 (pl) | 2011-03-30 | 2012-01-26 | Urządzenie popychacza z kasowaniem luzu w zębatkowej przekładni kierowniczej samochodu |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1152654A FR2973324B1 (fr) | 2011-03-30 | 2011-03-30 | Dispositif de poussoir avec rattrapage de jeu pour direction a cremaillere de vehicule automobile |
| PCT/FR2012/050168 WO2012131200A1 (fr) | 2011-03-30 | 2012-01-26 | Dispositif de poussoir avec rattrapage de jeu pour direction à crémaillère de véhicule automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2691285A1 true EP2691285A1 (fr) | 2014-02-05 |
| EP2691285B1 EP2691285B1 (fr) | 2014-12-31 |
Family
ID=45774256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12706631.4A Not-in-force EP2691285B1 (fr) | 2011-03-30 | 2012-01-26 | Dispositif de poussoir avec rattrapage de jeu pour direction à crémaillère de véhicule automobile |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2691285B1 (fr) |
| FR (1) | FR2973324B1 (fr) |
| PL (1) | PL2691285T3 (fr) |
| WO (1) | WO2012131200A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3820415A (en) | 1973-03-01 | 1974-06-28 | Trw Inc | Rack and pinion assembly |
| DE19539864C1 (de) | 1995-10-26 | 1997-01-23 | Trw Fahrwerksyst Gmbh & Co | Zahnstangengetriebe |
| US6247375B1 (en) | 1999-04-23 | 2001-06-19 | Trw Inc. | Apparatus for turning steerable vehicle wheels |
| US8336413B2 (en) | 2005-06-30 | 2012-12-25 | Steering Solutions Ip Holding Corporation | Rack and pinion steering apparatus having rack bearing wear compensation with damping |
| FR2934228B1 (fr) * | 2008-07-23 | 2010-07-30 | Jtekt Europe Sas | Dispositif de poussoir a exentrique pour direction a cremaillere de vehicule automobile |
| FR2938034B1 (fr) * | 2008-11-06 | 2011-10-07 | Jtekt Europe Sas | Dispositif de poussoir a excentrique pour direction de vehicule automobile |
| FR2951797B1 (fr) | 2009-10-23 | 2011-10-28 | Jtekt Europe Sas | Dispositif de poussoir avec compensation de jeu pour direction a cremaillere de vehicule automobile |
-
2011
- 2011-03-30 FR FR1152654A patent/FR2973324B1/fr not_active Expired - Fee Related
-
2012
- 2012-01-26 WO PCT/FR2012/050168 patent/WO2012131200A1/fr not_active Ceased
- 2012-01-26 PL PL12706631T patent/PL2691285T3/pl unknown
- 2012-01-26 EP EP12706631.4A patent/EP2691285B1/fr not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012131200A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2691285T3 (pl) | 2015-05-29 |
| WO2012131200A1 (fr) | 2012-10-04 |
| EP2691285B1 (fr) | 2014-12-31 |
| FR2973324A1 (fr) | 2012-10-05 |
| FR2973324B1 (fr) | 2013-04-12 |
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